Burglar-alarm for safes



(No Model.) Y .2 sheets-sheen 1.

J. W. 8v W. D. GILSTRAP.

'BURGLAR ALARM POR SAFBS.

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(No Model.) 2 Sheets-Sheet 2.

J.W.' au W. D. GILSTRAP. BURGLAR ALARM F011, SAFES.

No. 530,411. Patented Deo. 4, 1894.

W/TNESSES:

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A TTOHNE YS.

f .UNITED- STATES Fries.

JAMES W. GILSTRAP, `OF. ROLLA, AND WILLIAM D. GILSTRAP, OF RACINE, ASSIGNORS OF ONE-THIRD TO AUSTIN L. MCRAE, OF ROLLA, MISSOURI.

SPECIFICATION forming part 0f Letters"1atent No. 530,411, dated December 4, 1894. y

. Application filed April24,`1$94. y Serial Nd 508,'79'7. (No model.)

Be it known that We, JAMES W. GILSTRAP,

of Rolla, in the county of Phelps, and WIL- LIAM D. GILsTRAP, of Racine, in the county of Newton, State of Missouri, have invented a new and Improved Burglar-Alarm for Safes, of which the following isa full, clear and exact description. c

Our invention relates to that class of burglar alarms which are adapted for use in connection with safes and similar things, and which are adapted to sound an alarm in case the safe is tampered with.

The object of our invention is to produce a simple apparatus of this kind, adapted to envelop a safe or similar thing and arranged in such a waythat if any attempt is made to reach'or tamper with the safe an alarm will be sounded.

To this end our invention consists of certain features of construction `and combinations of parts, which will be hereinafter described and claimed.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar figures and letters of reference indicate corresponding parts in all the views.

Figure lis a broken front elevation of our improved apparatus as applied to a safe. Fig. 2 is a sectional plan of the same; and Fig. 3 is an enlarged detail view, showing how the two inclosing envelopes are arranged on the safe. Fig. 4 is a diagram illustrating the circuits. i

The safe 10 may be of any usual make, or any other metallic article may be protected as the safe is protected, which manner of protection will appear below.` The safe l0 is inc osed by a metallic envelope 1l, which does not touch the safe and is insulated from it,

the envelope having a door 12 opposite the safe door to enable the latter door to be easily reached. `The envelope 11 rests on springs 13 which are mounted on insulating blocks 14 on the safe top, although the envelope may be insulated from the safein any other manner. The envelope has depending from its top contact blocks 15, and if pressure is ap` plied to the top of the envelope the springs are compressed and the contactblocks, striky ing the safe closes the circuit through an alarm, as hereinafter described.

` l The envelope 11 is inclosed by another en- 4on the oor and having in fronta door 17 opposite the doors of the sate `and inner envelzope. A spring 18 is insulated on the envelope, near the free edge of the door, so as to touch the door when the latter is closed, and' when the door is opened the spring acts as a circuit breaker, as will appear in following out the circuits. y

The envelopes 1l` and 16 have in-turned flanges 19 and 20, so that in caseeither envelope is raised it will strike either the f.safe or the other envelope, thus closing the circuit and sounding an alarm.

l A battery A is arranged beneath thesafe or in some other convenient place, and one pole of the battery connects by two wires a with the safe and with the outer envelope 16, while the other pole of the battery connects by means of a `wire a. with an electric bell 21 or other electric alarm which may be arranged in any desired locality, and the return Wire a2 extends from the bell to the inner envelope 11. It will thus be seen that if the envelopes are moved so as to cause the inner one to contact with the safe, the circuit will be closed through the alarm and the attempts of the burglars frustrated. A closed circuit battery B is also arranged beneath the safe or in some other convenient place, and a wire b connects the battery with contact lugs 21 which are secured to the door and connect with the outer envelope 16,and another wire h leads from the other pole of the battery to a circuit closer 22 which may be of any usual kind and a wire b2 leads from` the circuit closer to the circuit breaking spring 18. The circuit closer is operated by the breaking of the circuit of the battery B and it connects, when operated, the Wires c and c with the bell 21, or other equivalent alarm.

The circuit-closer, 22, here" shown is cornposed of an electro-magnet (in circuit with the wires b b2 of battery B), and a hinged armature, which normally rests on said magnet, but is raised by a spring when the circuit through the magnet is broken. The said armature normally holds a hinged drop bar in elevated position. The wires, c, c', are branches of the open circuit wires a', a2, respectively, and their free ends are arranged in such proximity and relation to the drop of thecircuit-closer, 22, that, when the circuit through battery, B, is broken, the drop falls (see dotted lines in Fig. 4,) and strikes upon both such free ends of the wires, c c', thereby closing a circuit through the bell, 2l, and sounding an alarm.

It will be seen that the circuit from the battery B will be normally through the Wire b, the contacts 21, the outer envelope 16, the spring 18, the wire b2, the circuit closer 22, and the Wire b back to the battery. If the door 17 is opened, it will be seen that the circuit will be broken, thus permitting the circuit closer to close the circuit through the alarm, or if the envelope 16 is lifted, the circuit Will be broken with the same result. The several wires are preferably twisted into a single cable, and then the wires of the bell circuit cannot be cut without a liability of cutting the relay wires and ringing an alarm.

We do not confine ourselves to the precise arrangement of the parts specified, nor to the particular connections shown, as it is obvious that these may be `changed considerably without affecting the principle of our invention.

Having thus described our invention, we claim as new and desire to secure by Letters Patent- 1. The combination with the safe, of an inclosing, movable, rigid, metallic envelope, insulating media which separate them, means for making contact between them, and an elec# trical circuit,a circuit-closer, and alarm, as shown and described, whereby the movement of the envelope, bodily, in any direction, closes said circuit and sounds the alarm, as specified. v

2. The combination with the safe, of an inclosing, rigid, metallic envelope, a second envelope inclosing the first, both being movable bodily, means for insulating the inner envelope and making contact, an electrical circuit and connections between the safe and two envelopes, and an alarm includedin said circuit, as shown and described.

3. The combination, with the safe, of the inner envelope inclosing the safe and provided with a door, the inner envelope being insulated from the safe, an outer envelope electrically connected with the safe and insulated from the inner envelope, in-turned lian ges or contacts on the two envelopes, and electrical connections between a source of electricity and the safe and outer envelope and between such source and the inner envelope, substantially as described.

4. The combination, with the safe and the inner envelope, of insulated springs supporting the envelope on the safe, contacts carried by the envelope to touch the safe an electric alarm, and an electric circuit including the safe, the envelope and the alarm, substantially as described.

JAMES W.- GILSTRAP. WILLIAM D. GILSTRAP. Witnesses:

W. B. HARRIS, R. R. DIoKERsoN. 

